Silver fractal dendrites for highly sensitive and transparent polymer thermistors

Kim, Jongyoun; Lee, Donghwa; Park, Kyutae; Goh, Hyeonjin; Lee, Youngu

doi:10.1039/c9nr04233d

Cited by 22 publications

(13 citation statements)

References 42 publications

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“…This value is comparable to that of a film-type thermistor with a low loading concentration of fillers. [30] Furthermore, we fabricated the composite fibers on an ultrathin substrate to obtain an ultraflexible mesh thermistor. Reducing the overall thickness of a device can significantly reduce the strain caused by bending.…”

Section: Resultsmentioning

confidence: 99%

“…[ 27 ] The thermistor has the property of increasing the resistance sharply by more than three orders of magnitude as the temperature increases. [ 28 , 29 , 30 , 31 , 32 , 33 ] The large change in resistance in a narrow temperature range has been applied in sensitive temperature sensors [ 28 , 29 , 30 ] and self‐temperature‐controllable devices. [ 31 , 32 , 33 ] Commercial polymer PTC thermistors are sized several hundred micrometers.…”

Section: Introductionmentioning

confidence: 99%

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Ultrathin Fiber‐Mesh Polymer Thermistors

2022

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Flexible sensors enable on-skin and in-body health monitoring, which require flexible thermal protection circuits to prevent overheating and operate the devices safely. Here, ultrathin fiber-mesh polymer positive temperature coefficient (PTC) thermistors via electrospinning are developed. The fiber-type thermistors are composed of acrylate polymer and carbon nanofibers. The fibrous composite materials are coated with a parylene to form a core-sheath structure, which improves the repeatability of temperature characteristics. Approximately 5 μm thick fiber-type thermistors exhibit an increase in the resistance by three orders of magnitude within ≈2 °C and repeatable temperature characteristics for up to 400 cycles. The mesh structure enables the thermistor layer to be ultra-lightweight and transparent; the mesh-type thermistor operates with a fiber density of 16.5 μg cm −2 , whose fiber layer has a transmittance of more than 90% in the 400-800 nm region. By fabricating the mesh thermistor on a 1.4 μm thick substrate, the thermistor operates without degradation when wrapped around a 280 μm radius needle. Furthermore, the gas-permeable property is demonstrated by fabricating the fibrous thermistor on a mesh substrate. The proposed ultrathin mesh polymer PTC thermistors form the basis for on-skin and implantable devices that are equipped with overheat prevention.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrathin Fiber‐Mesh Polymer Thermistors

2022

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“…The temperature coefficient effect of CPCs is closely related to the fillers, and CB and silver usually show the opposite temperature coefficient properties of NTC and PTC in composite systems. [31,32] The PTC effect comes from two aspects. On one hand, it is derived from the thermal expansion of the polymer matrix.…”

Section: Temperature Coefficient Propertiesmentioning

confidence: 99%

Synergistic Superiority of a Silver‐Carbon Black‐Filled Conductive Polymer Composite for Temperature–Pressure Sensing

et al. 2021

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Flexible conductive polymer composites (CPCs) are creating new opportunities in soft electronics and their applications. Compared with CPCs based on unary filler systems, CPCs with binary fillers have plenty of advantages in mechanical and electrical properties due to the synergistic superiority of fillers. Herein, a new kind of flexible binary fillers CPC composed of nano-sized carbon black (CB) particles and micro-sized silver (Ag) platelets uniformly dispersed in polydimethylsiloxane (PDMS) is reported and named Ag-CB-PDMS. A synergistic conductive network structure based on observation of scanning electron microscope (SEM) is proposed. The conductivity is approximately 20 times higher than that of unary filler system, with a threefold improvement in its stability. Through the regulation of the filler concentration, the temperature coefficient can be adjusted, and the resistance is insensitive to temperature when silver and carbon black concentrations are 15 and 18 wt%, respectively. Meanwhile, Ag-CB-PDMS retains good flexibility and shows excellent piezoresistive characteristics. During compressionrelease cycles, Ag-CB-PDMS exhibits excellent stability, good repeatability (1000 cycles), and fast response time (52 ms). A temperature-pressure sensor is constructed based on Wheatstone bridge for real-time monitoring of lithium-ion batteries (LiBs) to achieve early safety warning.

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“…Recently, due to the excellent processing performance, low cost, low density, good mechanical properties, and corrosion resistance, conductive polymer composites (CPCs) materials have been widely used in the industrial field such as thermistors [3][4][5][6],…”

Section: Introductionmentioning

confidence: 99%

Supercritical Fluids-Assisted Processing Using CO2 Foaming to Enhance the Dispersion of Nanofillers in Poly(butylene succinate)-Based Nanocomposites and the Conductivity

et al. 2022

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Silver fractal dendrites for highly sensitive and transparent polymer thermistors

Abstract: A highly sensitive and transparent polymer thermistor has been successfully demonstrated using silver fractal dendrites for effective temperature measurement.

Cited by 22 publications

References 42 publications

Ultrathin Fiber‐Mesh Polymer Thermistors

Ultrathin Fiber‐Mesh Polymer Thermistors

Synergistic Superiority of a Silver‐Carbon Black‐Filled Conductive Polymer Composite for Temperature–Pressure Sensing

Supercritical Fluids-Assisted Processing Using CO2 Foaming to Enhance the Dispersion of Nanofillers in Poly(butylene succinate)-Based Nanocomposites and the Conductivity

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